#>

<######## Default Parameters. Don't modify this ########>

param($SCPath, $Sub, $Intag, $Resources, $Task ,$File, $SmaResources, $TableStyle, $Unsupported)

If ($Task -eq 'Processing')
{

        $vm =  $Resources | Where-Object {$_.TYPE -eq 'microsoft.compute/virtualmachines'}
        $nic = $Resources | Where-Object {$_.TYPE -eq 'microsoft.network/networkinterfaces'}
        $vmexp = $Resources | Where-Object {$_.TYPE -eq 'microsoft.compute/virtualmachines/extensions'}
        $disk = $Resources | Where-Object {$_.TYPE -eq 'microsoft.compute/disks'}
        $vmsizemap = @{}
        foreach($location in ($vm | Select-Object -ExpandProperty location -Unique))
            {
                foreach ($vmsize in ( az vm list-sizes -l $location | ConvertFrom-Json))
                    {
                        $vmsizemap[$vmsize.name] = @{
                            CPU = $vmSize.numberOfCores
                            RAM = [math]::Round($vmSize.memoryInMB / 1024, 0) 
                        }
                    }
            }

    if($vm)
        {    
            $tmp = @()

            foreach ($1 in $vm) 
                {
                    $ResUCount = 1
                    $sub1 = $SUB | Where-Object { $_.id -eq $1.subscriptionId }
                    $data = $1.PROPERTIES 
                    $timecreated = $data.timeCreated
                    $timecreated = [datetime]$timecreated
                    $timecreated = $timecreated.ToString("yyyy-MM-dd HH:mm")
                    $AVSET = ''
                    $dataSize = ''
                    $StorAcc = ''

                    $RetDate = ''
                    $RetFeature = '' 
                    if($data.hardwareProfile.vmSize -in ('basic_a0','basic_a1','basic_a2','basic_a3','basic_a4','standard_a0','standard_a1','standard_a2','standard_a3','standard_a4','standard_a5','standard_a6','standard_a7','standard_a9') -or $1.sku.name -in ('basic_a0','basic_a1','basic_a2','basic_a3','basic_a4','standard_a0','standard_a1','standard_a2','standard_a3','standard_a4','standard_a5','standard_a6','standard_a7','standard_a9'))
                        {
                            $RetDate = ($Unsupported | Where-Object {$_.Id -eq 1}).RetirementDate
                            $RetFeature = ($Unsupported | Where-Object {$_.Id -eq 1}).RetiringFeature
                        }
                    if($data.hardwareProfile.vmSize -in ('Standard_NV12','Standard_NV12_Promo','Standard_NV24','Standard_NV24_Promo','Standard_NV6','Standard_NV6_Promo') -or $1.sku.name -in ('Standard_NV12','Standard_NV12_Promo','Standard_NV24','Standard_NV24_Promo','Standard_NV6','Standard_NV6_Promo'))
                        {
                            $RetDate = ($Unsupported | Where-Object {$_.Id -eq 18}).RetirementDate
                            $RetFeature = ($Unsupported | Where-Object {$_.Id -eq 18}).RetiringFeature
                        }
                    if($data.hardwareProfile.vmSize -in ('Standard_NC6','Standard_NC6_Promo','Standard_NC12','Standard_NC12_Promo','Standard_NC24','Standard_NC24_Promo','Standard_NC24r','Standard_NC24r_Promo') -or $1.sku.name -in ('Standard_NC6','Standard_NC6_Promo','Standard_NC12','Standard_NC12_Promo','Standard_NC24','Standard_NC24_Promo','Standard_NC24r','Standard_NC24r_Promo'))
                        {
                            $RetDate = ($Unsupported | Where-Object {$_.Id -eq 37}).RetirementDate
                            $RetFeature = ($Unsupported | Where-Object {$_.Id -eq 37}).RetiringFeature
                        }
                    if($data.hardwareProfile.vmSize -in ('Standard_NC6s_v2','Standard_NC12s_v2','Standard_NC24s_v2','Standard_NC24rs_v2') -or $1.sku.name -in ('Standard_NC6s_v2','Standard_NC12s_v2','Standard_NC24s_v2','Standard_NC24rs_v2'))
                        {
                            $RetDate = ($Unsupported | Where-Object {$_.Id -eq 38}).RetirementDate
                            $RetFeature = ($Unsupported | Where-Object {$_.Id -eq 38}).RetiringFeature
                        }
                    if($data.hardwareProfile.vmSize -in ('Standard_ND6','Standard_ND12','Standard_ND24','Standard_ND24r') -or $1.sku.name -in ('Standard_ND6','Standard_ND12','Standard_ND24','Standard_ND24r'))
                        {
                            $RetDate = ($Unsupported | Where-Object {$_.Id -eq 39}).RetirementDate
                            $RetFeature = ($Unsupported | Where-Object {$_.Id -eq 39}).RetiringFeature
                        }
                    if($data.hardwareProfile.vmSize -in ('Standard_HB60rs','Standard_HB60-45rs','Standard_HB60-30rs','Standard_HB60-15rs') -or $1.sku.name -in ('Standard_HB60rs','Standard_HB60-45rs','Standard_HB60-30rs','Standard_HB60-15rs'))
                        {
                            $RetDate = ($Unsupported | Where-Object {$_.Id -eq 40}).RetirementDate
                            $RetFeature = ($Unsupported | Where-Object {$_.Id -eq 40}).RetiringFeature
                        }
                    if(!$data.storageProfile.osDisk.managedDisk.id)
                        {
                            $RetDate = ($Unsupported | Where-Object {$_.Id -eq 4}).RetirementDate
                            $RetFeature = ($Unsupported | Where-Object {$_.Id -eq 4}).RetiringFeature
                        }
                    
                    $UpdateMgmt = if ($null -eq $data.osProfile.LinuxConfiguration.patchSettings.patchMode) { $data.osProfile.WindowsConfiguration.patchSettings.patchMode } else { $data.osProfile.LinuxConfiguration.patchSettings.patchMode }                    

                    $ext = @()
                    $AzDiag = ''
                    $Azinsights = ''
                    $Lic = switch ($data.licenseType) {
                        'Windows_Server' { 'Azure Hybrid Benefit for Windows' }
                        'Windows_Client' { 'Windows client with multi-tenant hosting' }
                        'RHEL_BYOS' { 'Azure Hybrid Benefit for Redhat' }
                        'SLES_BYOS' { 'Azure Hybrid Benefit for SUSE' }
                        default { $data.licenseType }
                    }
                    $Lic = if($Lic){$Lic}else{'None'}
                    $ext = ($vmexp | Where-Object { ($_.id -split "/")[8] -eq $1.name }).properties.Publisher
                    if ($null -ne $ext) 
                        {
                            $ext = foreach ($ex in $ext) 
                                {
                                    if ($ex | Where-Object { $_ -eq 'Microsoft.Azure.Performance.Diagnostics' }) { $AzDiag = $true }
                                    if ($ex | Where-Object { $_ -eq 'Microsoft.EnterpriseCloud.Monitoring' }) { $Azinsights = $true }
                                    $ex + ', '
                                }
                            $ext = [string]$ext
                            $ext = $ext.Substring(0, $ext.Length - 2)
                        }

                    if ($null -ne $data.availabilitySet) { $AVSET = 'True' }else { $AVSET = 'False' }
                    if ($data.diagnosticsProfile.bootDiagnostics.enabled -eq $true) { $bootdg = $true }else { $bootdg = $false }
                    if($data.storageProfile.osDisk.managedDisk.id) 
                        {
                            $OSDisk = ($disk | Where-Object {$_.id -eq $data.storageProfile.osDisk.managedDisk.id} | Select-Object -Unique).sku.name
                            $OSDiskSize = ($disk | Where-Object {$_.id -eq $data.storageProfile.osDisk.managedDisk.id} | Select-Object -Unique).Properties.diskSizeGB
                        }
                    else
                        {
                            $OSDisk = if($data.storageProfile.osDisk.vhd.uri){'Custom VHD'}else{''}
                            $OSDiskSize = $data.storageProfile.osDisk.diskSizeGB
                        }
                    $StorAcc = if ($data.storageProfile.dataDisks.managedDisk.id.count -ge 2) 
                                { 
                                    ($data.storageProfile.dataDisks.managedDisk.id.count.ToString() + ' Disks found.') 
                                }
                                else 
                                { 
                                    ($disk | Where-Object {$_.id -eq $data.storageProfile.dataDisks.managedDisk.id} | Select-Object -Unique).sku.name
                                }
                    $dataSize = if ($data.storageProfile.dataDisks.managedDisk.storageAccountType.count -ge 2) 
                                { 
                                    (($disk | Where-Object {$_.id -in $data.storageProfile.dataDisks.managedDisk.id}).properties.diskSizeGB | Measure-Object -Sum).Sum
                                }
                                else 
                                { 
                                    ($disk | Where-Object {$_.id -eq $data.storageProfile.dataDisks.managedDisk.id}).properties.diskSizeGB
                                }                    
                    $Tags = if(![string]::IsNullOrEmpty($1.tags.psobject.properties)){$1.tags.psobject.properties}else{'0'}
                    $VMNICS = if(![string]::IsNullOrEmpty($data.networkProfile.networkInterfaces.id)){$data.networkProfile.networkInterfaces.id}else{'0'}
                    foreach ($2 in $VMNICS) {

                        $vmnic = $nic | Where-Object { $_.ID -eq $2 } | Select-Object -Unique
                        $vmnsg = if($vmnic.properties.networkSecurityGroup.id){$vmnic.properties.networkSecurityGroup.id.split('/')[8]}else{'None'}
                        $PIP = $vmnic.properties.ipConfigurations.properties.publicIPAddress.id.split('/')[8]
                        $VNET = $vmnic.properties.ipConfigurations.properties.subnet.id.split('/')[8]
                        $Subnet = $vmnic.properties.ipConfigurations.properties.subnet.id.split('/')[10]



                        foreach ($Tag in $Tags) 
                            {
                                $obj = @{
                                'ID'                            = $1.id;
                                'Subscription'                  = $sub1.Name;
                                'Resource Group'                = $1.RESOURCEGROUP;
                                'VM Name'                       = $1.NAME;
                                'Location'                      = $1.LOCATION;
                                'Zone'                          = [string]$1.ZONES;
                                'Availability Set'              = $AVSET;
                                'VM Size'                       = $data.hardwareProfile.vmSize;
                                'vCPUs'                         = $vmsizemap[$data.hardwareProfile.vmSize].CPU;
                                'RAM (GiB)'                     = $vmsizemap[$data.hardwareProfile.vmSize].RAM;
                                'Image Reference'               = $data.storageProfile.imageReference.publisher;
                                'Image Version'                 = $data.storageProfile.imageReference.exactVersion;
                                'Hybrid Benefit'                = $Lic;
                                'Admin Username'                = $data.osProfile.adminUsername;
                                'OS Type'                       = $data.storageProfile.osDisk.osType;
                                'OS Name'                       = $data.extended.instanceView.osname;
                                'OS Version'                    = $data.extended.instanceView.osversion;
                                'Retirement Date'               = [string]$RetDate;
                                'Retirement Feature'            = $RetFeature;
                                'Update Management'             = $UpdateMgmt;
                                'Boot Diagnostics'              = $bootdg;
                                'Performance Agent'             = if ($azDiag -ne '') { $true }else { $false };
                                'Azure Monitor'                 = if ($Azinsights -ne '') { $true }else { $false };
                                'OS Disk Storage Type'          = $OSDisk;
                                'OS Disk Size (GB)'             = $OSDiskSize;
                                'Data Disk Storage Type'        = $StorAcc;
                                'Data Disk Size (GB)'           = $dataSize;
                                'Power State'                   = $data.extended.instanceView.powerState.displayStatus;
                                'NIC Name'                      = [string]$vmnic.name;
                                'NIC Type'                      = [string]$vmnic.properties.nicType;
                                'DNS Servers'                   = [string]$vmnic.properties.dnsSettings.dnsServers;
                                'Public IP'                     = $PIP;
                                'Virtual Network'               = $VNET;
                                'Subnet'                        = $Subnet;
                                'NSG'                           = $vmnsg;
                                'Accelerated Networking'        = [string]$vmnic.properties.enableAcceleratedNetworking;
                                'IP Forwarding'                 = [string]$vmnic.properties.enableIPForwarding;
                                'Private IP Address'            = [string]$vmnic.properties.ipConfigurations.properties.privateIPAddress;
                                'Private IP Allocation'         = [string]$vmnic.properties.ipConfigurations.properties.privateIPAllocationMethod;
                                'Created Time'                  = $timecreated;
                                'VM Extensions'                 = $ext;
                                'Resource U'                    = $ResUCount;
                                'Tag Name'                      = [string]$Tag.Name;
                                'Tag Value'                     = [string]$Tag.Value
                                }
                                $tmp += $obj
                                if ($ResUCount -eq 1) { $ResUCount = 0 } 
                            }
                            Remove-Variable PIP, vmnic, vmnsg, VNET, Subnet                        
                        }
                    }
                    $tmp
        }            
}
else
{
    If($SmaResources.VM)
        {
            $TableName = ('VMTable_'+($SmaResources.VM.id | Select-Object -Unique).count)
            $Style = New-ExcelStyle -HorizontalAlignment Center -AutoSize -NumberFormat '0' -VerticalAlignment Center
            $StyleExt = New-ExcelStyle -HorizontalAlignment Left -Range AK:AK -Width 60 -WrapText 

                $cond = @()
                #Hybrid Benefit
                $cond += New-ConditionalText None -Range O:O
                #NSG
                $cond += New-ConditionalText None -Range AE:AE
                #Boot Diagnostics
                $cond += New-ConditionalText falso -Range R:R
                $cond += New-ConditionalText false -Range R:R
                #Performance Agent
                $cond += New-ConditionalText falso -Range S:S
                $cond += New-ConditionalText false -Range S:S
                #Azure Monitor
                $cond += New-ConditionalText falso -Range T:T
                $cond += New-ConditionalText false -Range T:T
                #Acelerated Network
                $cond += New-ConditionalText false -Range AG:AG
                $cond += New-ConditionalText falso -Range AG:AG  
                #Retirement
                $cond += New-ConditionalText - -Range M:M -ConditionalType ContainsText
    
                $Exc = New-Object System.Collections.Generic.List[System.Object]
                $Exc.Add('Subscription')
                $Exc.Add('Resource Group')
                $Exc.Add('VM Name')
                $Exc.Add('VM Size')
                $Exc.Add('vCPUs')
                $Exc.Add('RAM (GiB)')
                $Exc.Add('Location')
                $Exc.Add('OS Type')
                $Exc.Add('OS Name')
                $Exc.Add('OS Version')
                $Exc.Add('Image Reference')
                $Exc.Add('Image Version')
                $Exc.Add('Retirement Date')
                $Exc.Add('Retirement Feature')
                $Exc.Add('Hybrid Benefit')
                $Exc.Add('Admin Username')
                $Exc.Add('Update Management')
                $Exc.Add('Boot Diagnostics')
                $Exc.Add('Performance Agent')
                $Exc.Add('Azure Monitor')
                $Exc.Add('OS Disk Storage Type')
                $Exc.Add('OS Disk Size (GB)')
                $Exc.Add('Data Disk Storage Type')
                $Exc.Add('Data Disk Size (GB)')
                $Exc.Add('Power State')
                $Exc.Add('Availability Set')
                $Exc.Add('Zone')    
                $Exc.Add('Virtual Network')
                $Exc.Add('Subnet')
                $Exc.Add('DNS Servers')
                $Exc.Add('NSG')
                $Exc.Add('NIC Name')
                $Exc.Add('Accelerated Networking')
                $Exc.Add('IP Forwarding')
                $Exc.Add('Private IP Address')
                $Exc.Add('Private IP Allocation')
                $Exc.Add('Public IP')
                $Exc.Add('Created Time')                
                $Exc.Add('VM Extensions')
                $Exc.Add('Resource U')
                if($InTag)
                {
                    $Exc.Add('Tag Name')
                    $Exc.Add('Tag Value') 
                }
    
                $noNumberConversion = @()
                $noNumberConversion += 'OS Version'
                $noNumberConversion += 'Image Version'
                $noNumberConversion += 'Private IP Address'
                $noNumberConversion += 'DNS Servers'

                $ExcelVar = $SmaResources.VM
                            
                $ExcelVar | 
                ForEach-Object { [PSCustomObject]$_ } | Select-Object -Unique $Exc | 
                Export-Excel -Path $File -WorksheetName 'Virtual Machines' -TableName $TableName -MaxAutoSizeRows 100 -TableStyle $tableStyle -ConditionalText $cond -Style $Style, $StyleExt -NoNumberConversion $noNumberConversion

                $excel = Open-ExcelPackage -Path $File -KillExcel
    
                $null = $excel.'Virtual Machines'.Cells["M1"].AddComment("It's important to be aware of upcoming Azure services and feature retirements to understand their impact on your workloads and plan migration.", "Azure Resource Inventory")
                $excel.'Virtual Machines'.Cells["M1"].Hyperlink = 'https://learn.microsoft.com/en-us/azure/advisor/advisor-how-to-plan-migration-workloads-service-retirement'
                $null = $excel.'Virtual Machines'.Cells["R1"].AddComment("Boot diagnostics is a debugging feature for Azure virtual machines (VM) that allows diagnosis of VM boot failures.", "Azure Resource Inventory")
                $excel.'Virtual Machines'.Cells["R1"].Hyperlink = 'https://docs.microsoft.com/en-us/azure/virtual-machines/boot-diagnostics'
                $null = $excel.'Virtual Machines'.Cells["S1"].AddComment("Is recommended to install Performance Diagnostics Agent in every Azure Virtual Machine upfront. The agent is only used when triggered by the console and may save time in an event of performance struggling.", "Azure Resource Inventory")
                $excel.'Virtual Machines'.Cells["S1"].Hyperlink = 'https://docs.microsoft.com/en-us/azure/virtual-machines/troubleshooting/performance-diagnostics'
                $null = $excel.'Virtual Machines'.Cells["T1"].AddComment("We recommend that you use Azure Monitor to gain visibility into your resource's health.", "Azure Resource Inventory")
                $excel.'Virtual Machines'.Cells["T1"].Hyperlink = 'https://docs.microsoft.com/en-us/azure/security/fundamentals/iaas#monitor-vm-performance'
                $null = $excel.'Virtual Machines'.Cells["AE1"].AddComment("Use a network security group to protect against unsolicited traffic into Azure subnets. Network security groups are simple, stateful packet inspection devices that use the 5-tuple approach (source IP, source port, destination IP, destination port, and layer 4 protocol) to create allow/deny rules for network traffic.", "Azure Resource Inventory")
                $excel.'Virtual Machines'.Cells["AE1"].Hyperlink = 'https://docs.microsoft.com/en-us/azure/security/fundamentals/network-best-practices#logically-segment-subnets'
                $null = $excel.'Virtual Machines'.Cells["AG1"].AddComment("Accelerated networking enables single root I/O virtualization (SR-IOV) to a VM, greatly improving its networking performance. This high-performance path bypasses the host from the datapath, reducing latency, jitter, and CPU utilization.", "Azure Resource Inventory")
                $excel.'Virtual Machines'.Cells["AG1"].Hyperlink = 'https://docs.microsoft.com/en-us/azure/virtual-network/create-vm-accelerated-networking-cli'

            Close-ExcelPackage $excel
        }             

}

foreach ($1 in $vm) 
{
    # ... complex processing for each VM ...
    $tmp += $obj
}
Optimized using parallel processing:

powershell
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# Define scriptblock for processing each VM
$scriptBlock = {
    param($vmItem)
    # ... complex processing for each VM ...
    return $obj
}

$scriptBlock contains the code that was previously inside the foreach loop.
ForEach-Object -Parallel runs the script block in parallel for each item in $vm.
-ArgumentList $_ passes each VM item to the script block.
-ThrottleLimit 10 limits the number of parallel tasks. Adjust this based on your environment's capabilities.

Original code snippet:

powershell
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$vmsizemap = @{}
foreach($location in ($vm | Select-Object -ExpandProperty location -Unique))
{
    foreach ($vmsize in ( az vm list-sizes -l $location | ConvertFrom-Json))
    {
        $vmsizemap[$vmsize.name] = @{
            CPU = $vmSize.numberOfCores
            RAM = [math]::Round($vmSize.memoryInMB / 1024, 0) 
        }
    }
}

$vmsizemap = @{}
$locationSizeMap = @{} # Cache for API results

foreach($location in ($vm | Select-Object -ExpandProperty location -Unique))
{
    # Check if the sizes for this location are already fetched
    if(-not $locationSizeMap.ContainsKey($location))
    {
        # Fetch and cache the VM sizes for this location
        $locationSizeMap[$location] = az vm list-sizes -l $location | ConvertFrom-Json
    }

    foreach ($vmsize in $locationSizeMap[$location])
    {
        $vmsizemap[$vmsize.name] = @{
            CPU = $vmsize.numberOfCores
            RAM = [math]::Round($vmsize.memoryInMB / 1024, 0) 
        }
    }
}

foreach ($1 in $vm) 
{
    # ... other processing ...

    $VMNICS = if(![string]::IsNullOrEmpty($data.networkProfile.networkInterfaces.id)){$data.networkProfile.networkInterfaces.id}else{'0'}
    foreach ($2 in $VMNICS) 
    {
        $vmnic = $nic | Where-Object { $_.ID -eq $2 } | Select-Object -Unique
        # ... processing involving $vmnic ...
    }

    # ... more processing ...
}

# Create a hashtable to map NIC IDs to their details
$nicDetailsMap = @{}
foreach ($nicItem in $nic) 
{
    $nicDetailsMap[$nicItem.ID] = $nicItem
}

foreach ($1 in $vm) 
{
    # ... other processing ...

    $VMNICS = if(![string]::IsNullOrEmpty($data.networkProfile.networkInterfaces.id)){$data.networkProfile.networkInterfaces.id}else{'0'}
    foreach ($2 in $VMNICS) 
    {
        if ($nicDetailsMap.ContainsKey($2))
        {
            $vmnic = $nicDetailsMap[$2]
            # ... processing involving $vmnic ...
        }
    }

    # ... more processing ...
}

foreach ($1 in $vm) 
{
    # ... complex processing for each VM ...
    $tmp += $obj
}

foreach ($1 in $vm) 
{
    try 
    {
        # ... complex processing for each VM ...

        $tmp += $obj
    }
    catch 
    {
        Write-Error "Error processing VM with ID $($1.id): $_"
        # Optionally, log the error to a file or monitoring system
        # Continue processing the next VM instead of completely stopping the script
    }
}

$tmp = @()

foreach ($1 in $vm) 
{
    # ... complex processing for each VM ...
    $tmp += $obj
}
Optimized code using List<T>:

$tmp = New-Object System.Collections.Generic.List[object]

foreach ($1 in $vm) 
{
    # ... complex processing for each VM ...
    $tmp.Add($obj) # Use Add method to append to the list
}

foreach ($1 in $vm) 
{
    # ... some processing ...
    if ($1.someProperty -eq $null) {
        $1.someProperty = "Default"
    }
    # ... more processing ...
    if ($1.someProperty -eq $null) {
        $1.someProperty = "Default"
    }
    # ... even more processing ...
}

foreach ($1 in $vm) 
{
    # Simplify the null check and assignment
    $1.someProperty = $1.someProperty -if $null "Default"

    # ... rest of the processing ...
}

Improves Readability: By removing duplicate or redundant code, the script becomes easier to read and understand.
Increases Efficiency: Reducing the amount of code that needs to be executed can improve the script's performance, especially if the removed code involved complex operations or was inside a loop.

# Global variable declaration
$globalData = @{}

foreach ($1 in $vm) 
{
    # Uses and modifies the global variable
    $globalData[$1.id] = someProcessingFunction($1)
}

# More code that may or may not use $globalData
Optimized code with improved variable scoping:

powershell
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# Use and modify the local variable
$localData[$1.id] = someProcessingFunction($1)

# Process with $localData
# ...

# The $localData variable is discarded after each loop iteration,
# freeing up memory

# $localData is not accessible here, reducing the risk of unintended modifications

foreach ($vmInstance in $vm) 
{
    if ($vmInstance.someProperty -eq "Value1") {
        # Do something
    } elseif ($vmInstance.someProperty -eq "Value2") {
        # Do something else
    } elseif ($vmInstance.someProperty -eq "Value3" -or $vmInstance.someProperty -eq "Value4") {
        # Do another thing
    } else {
        # Default action
    }
}

function ProcessVMInstance($vmInstance) {
    switch ($vmInstance.someProperty) {
        "Value1" { 
            # Do something 
            break 
        }
        "Value2" { 
            # Do something else 
            break 
        }
        "Value3", "Value4" { 
            # Do another thing 
            break 
        }
        default { 
            # Default action 
        }
    }
}

foreach ($vmInstance in $vm) {
    ProcessVMInstance -vmInstance $vmInstance
}

Write-Host outputs the total processing time to the console.
By adding such timing measures around different sections of your script, you can identify which parts are the most time-consuming. This information is invaluable when deciding where to focus your optimization efforts.

For more detailed profiling, you might consider:

Using PowerShell's built-in Measure-Command cmdlet for simple timing.
Implementing more granular timing inside loops or function calls.
Using external tools or advanced techniques for more comprehensive profiling, especially if you're dealing with very complex or resource-intensive scripts.
User
show an example using the code. refactor for 9

ChatGPT
For the ninth optimization strategy, let's focus on more advanced profiling techniques to identify performance bottlenecks in your PowerShell script. Profiling involves tracking the execution time and resource usage of different parts of your script, which can be crucial for optimizing long and complex scripts.

Since PowerShell doesn't have an in-built comprehensive profiler, we'll use Measure-Command for simple timing and introduce custom logging for more detailed profiling.

Original code snippet:

powershell
Copy code

$startTime = Get-Date
. $ScriptBlock
$endTime = Get-Date

$duration = $endTime - $startTime
Write-Host "Block execution time: $($duration.TotalMilliseconds) ms"

# Wrapping the VM processing in a script block

In this optimized code:

A function Measure-ScriptBlockExecution is created to measure the execution time of a given script block. This function can be reused for different parts of the script.
The original VM processing logic is wrapped in a script block $vmProcessingScriptBlock.
The Measure-ScriptBlockExecution function is then called with the VM processing script block as a parameter, measuring and outputting the time taken for this part of the script.
This approach provides a flexible and reusable way to profile different sections of your PowerShell script. By isolating specific code blocks and measuring their execution time, you can identify which parts of the script are the most resource-intensive and therefore prime candidates for optimization.

For even more detailed profiling, you may consider:

Implementing more granular logging within loops or function calls, including logging start and end times of individual operations.
Capturing additional performance metrics, such as memory usage.
Using external tools or services for profiling if your script is part of a larger application or system.
User
show an example using the code. refactor for 10

ChatGPT
For the tenth optimization strategy, let's focus on updating and upgrading your script to use the latest versions of PowerShell and Azure modules. Keeping your script up to date can significantly enhance its performance and security, as newer versions often include optimizations, bug fixes, and security patches.

Refactoring your script to leverage the latest features of PowerShell and Azure modules might require:

Updating your PowerShell version.
Updating Azure-related modules.
Modifying the script to utilize new cmdlets or improved features.
Let's refactor a hypothetical section of your script to demonstrate how you can benefit from updates:

Original code snippet (assuming it's written in an older version of PowerShell):

powershell
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# Using an older cmdlet or approach
Get-AzureRmVm | Where-Object { $_.Location -eq "eastus" }
Refactored code using updated cmdlets (assuming newer Azure PowerShell module):

# First, update the Azure PowerShell module
# Install-Module -Name Az -AllowClobber -Force

# Using updated cmdlet from the Az module
Get-AzVM | Where-Object { $_.Location -eq "eastus" }

In this refactored code:

The script is updated to use the Az module, which is the successor to the AzureRm module and offers better performance and more features.
The cmdlet Get-AzVM is used instead of Get-AzureRmVm, which is part of the newer module.
Steps to update your script:

- Update PowerShell: Make sure you are using a recent version of PowerShell. PowerShell 7.x offers significant performance improvements and new features compared to Windows PowerShell 5.1.
- Update Azure Modules: Replace older AzureRM modules with the latest Az modules. The Az module is faster, more reliable, and has more capabilities.
- Refactor Script: Modify your script to use new cmdlets and features from the updated modules. This might include changing cmdlet names, parameters, and potentially altering the logic to be more efficient with the new capabilities.
- Remember to thoroughly test your script after these updates to ensure that all functionality works as expected with the new versions. Major updates can sometimes introduce breaking changes, so it's important to validate your script's behavior in a controlled environment before deploying it in production.